- Fear Planet: Skip's story sees Mordecai, Rigby, Benson, Pops and him traveling in space in a VW Wagon and needing to refuel to continue. They stop on a planet to get more fuel but find that it brings their worst fears to life if they think about it.
- King-Sized Candy Bars: Eileen's story finds Rigby, Mordecai, Muscle Man, Skips, and her trick-or-treating within the Space Tree Station. They come across a spooky looking house promising king size candy bars but find that it's filled with vampires.
- Alien Roommate: Rigby's story sees the park crew having to look for a new roommate to get extra funds. But the one they pick turns out to be an actual Xenomorph...and a very atrocious roommate at that.
In between the stories, the crew find themselves drifting toward a black hole which the park crew are trying steer away from.
Tropes:
- An Arm and a Leg: In Skips’ story, both of Benson’s arms get bitten off by sharks.
- And Then John Was a Zombie: All the protagonists in Eileen's story are turned into vampires.
- All for Nothing: In the second story, Mordecai, Rigby, and Eileen make it to the bowels of the house with the candy only to find out the full bars of chocolate are of a kind that no one likes.
- Author Tract: In-Universe, Skips’s story is a condemnation of flying disc freestyle spinners, to the point that it’s lampshaded.
- Big "NO!": Eileen in the second story when she find she's the only one left before the vampires get her.
- The Cameo: Neil DeGrasse Tyson shows up at the ending.
- Continuity Nod: One of the fears brought to life is Rigby's fear of amusement park mascots.
- Did Not Think This Through: Said word for word by Muscle Man when he knocks Shannon off the park ship without anyway to get back.
- Downer Ending: At the end, the ship is sucked into a black hole and the crew end up (literally) becoming spaghetti (as stated by Recap Bot earlier) only to be eaten by Neil deGrasse Tyson in an Italian restaurant.
- *Drool* Hello: Shannon does this before attacking in “Alien Roommate.”
- Dwindling Party: "Fear Planet" and "King Sized Candy Bars" have the protagonists being picked off one by one.
- Evil Laugh:
- Rigby, Mordecai, Muscle Man, Skips, Eileen, and the other vampires do this at the end of "King Sized Candy Bars" when they hear other trick or treaters coming into the house.
- Shannon gives one when the others finds that she damaged the button to open the airlock.
- Eyepatch of Power: Rigby dons one when gearing up to fight the vampires.Eileen: An eyepatch, Rigby?Rigby: Yeah! I'm feeling it!
- Faux Horrific: The fears in "Fear Planet." Benson's fear of sharks is normal enough, but then you have Skips' fear of flying disc free stylists and Rigby's fear of amusement park mascots. After the story, Mordecai points out that it's just Skips making excuses for his hatred of flying disc freestylers.
- Halloween Episode: This is the first (and only) Halloween special of the series that takes place in space.
- Heroic Sacrifice: Muscle Man makes one at the end of "Alien Roommate" to drive Shannon off the ship.
- Mona Lisa Smile: Sally goes as the Mona Lisa painting for Halloween.
- Prequel: Either that or out of order as this episode take place before "Space Escape."
- Rich in Dollars, Poor in Sense: Shannon who literally throws money at all her problems in order to avoid doing work.
- Rhymes on a Dime:Skips: If I can keep my mind clear, no fears will appear.
- Shout-Out:
- Naturally the costumes, this time we have Benson as Abe from Primer, Muscle Man as Zed from Zardoz, Fives as E.T, Eileen as Samus Aran from Metroid, Rigby and Mordecai as Tetsuo and Shōtarō from AKIRA. Skips isn't really in costume but has three nipples, a reference to the hooker from the original Total Recall (1990).
- In Eileen's story, Rigby and she are dress as Kathryn Janeway and Chakotay from Star Trek: Voyager, Skips is Ash in his getup from Army of Darkness, Muscle Man is Dr. Zaius from Planet of the Apes and Mordecai is Han Solo from Star Wars. When the group suit up to hunt the vampires, their outfits resemble that of the film version of Van Helsing.
- Skewed Priorities: Despite the fact that Shannon is an acid-spewing xenomorph, the others are more concerned about her being a bad roommate.
- The Thing That Would Not Leave: Shannon spends all day watching "Carter & Briggs" reruns than doing anything productive. When she's asked to leave, she becomes violently hostile.
- Vampire Episode: "King Sized Candy Bars" is focused on vampires.
- Vampires Hate Garlic: Eileen, Mordecai, Rigby, and Skips chase the vampires off in “King Sized Candy Bars” with boxed garlic mashed potatoes.
- "What Do They Fear?" Episode: The basis of Skip's story, though the others find out it was just his way of ranting about how much he hates flying disc freestylers.
- Whole-Plot Reference: "Alien Roommate" to Aliens obviously.
- Xenomorph Xerox: The group’s new roommate in “Alien Roommate,” which is to be expected when you’re trying to find a roommate in outer space.
